[Alan in AZ]

Cars (especially of this vintage) are low voltage high current systems - induced voltages are not significant issues in general - because the wires that might have any (very low) voitages induced on them will require significant current for operational changes to occur. The only places this is not true are some sensors that are run with shielding in their cables. Even the ECU sensors are typically quite immune from minor induced noise because they too are low resistance (relatively) biassed as needed to avoid noise (e.g. pull up resistors most commonly).,

Don't worry about it - an Danglerb says - since we do have relatively high current on many connections terminal resistances are a much bigger factor in electrical operation.

Alan